Question CPU Core Delta-T vs PWM Delta-T?

Nov 19, 2019
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Hi, this may be a simple question to answer but I haven’t found a specific response elsewhere.
In most reviews of CPU coolers, the delta-T performance is listed for four different setups - CPU Core @ max fan, CPU Core @ 50% fan, CPU PWM @ max fan, CPU PWM @ 50% fan.
The half vs max fan part is self explanatory, and I understand the meaning of delta-T. What I’m wondering is what “Core” means vs “PWM” - is core synonymous with DC control of the fan? I’m wondering why, if that’s the case, my PWM cooler fan is giving cooling performance that matches the Core temps-over-ambient found on this website (https://www.tomshardware.com/reviews/be-quiet-dark-rock-4-cpu-cooler,5563-2.html)
Thanks!
 
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